我从发送文件列表。net5的mvc项目。Net5API，但仅获取一个文件，而不是文件列表

Question

我有以下两种型号：

public class Category
{
  public int Id { get; set; }
  public string Name { get; set; }
  public List<CategoryDetail> CategoryDetails { get; set; }
}


public class CategoryDetail
{
  public int Id { get; set; }
  public string Url { get; set; }
  public IFormFile File { get; set; }
  public Category Category { get; set; }
}

我可以绑定分类详细模型。NET5 mvc文件列表。问题是，我得到只有一个文件时，它张贴到。NET5 API.在我看来，MultipartFormDataContent在循环遍历每个文件时无法绑定多个文件。

下面的代码向API发送post请求

var multiForm = new MultipartFormDataContent();
multiForm.Add(new StringContent(entity.Id), "Id");
multiForm.Add(new StringContent(Convert.ToString(entity.Name)), "Name");

**foreach (var item in entity.CategoryDetails)
{
  int i = 0;
  multiForm.Add(new StringContent(item.Url), 
 "CategoryDetails[" + i + "].Url");
  multiForm.Add(new StreamContent(item.File.OpenReadStream()), 
 "CategoryDetails[" + i + "].File", item.File.FileName);
  i++;
}**

 var request = new HttpRequestMessage(HttpMethod.Post, url) { Content = multiForm };

 var accessToken = _context.HttpContext.User.Claims.FirstOrDefault(c => 
 c.Type==AppClaims.AccessToken)?.Value;
 if (!string.IsNullOrEmpty(accessToken))
 {
   request.Headers.Authorization = new AuthenticationHeaderValue("Bearer", accessToken);
 }

 var client = _clientFactory.CreateClient("ApiServer");
 var response = await client.SendAsync(request).ConfigureAwait(false);

API控制器功能如下：

    [RequestSizeLimit(2147483648)]
    [HttpPost("add")]
    [Consumes(@"application/octet-stream", @"application/x-www-form-urlencoded", "multipart/form-data")]
    [ProducesResponseType(200, Type = typeof(BaseResponse))]

    public async Task<IActionResult> AddCategorySection([FromForm] 
    Category model)
    {
    }

Answer 1

以上代码将正常工作。我只是错误地初始化Foreach循环中的增量变量，每次初始化为0。正确的代码如下-

int i = 0;
foreach (var item in entity.CategoryDetails)
{
  multiForm.Add(new StringContent(item.Url), 
  "CategoryDetails[" + i + "].Url");
  multiForm.Add(new StreamContent(item.File.OpenReadStream()), 
  "CategoryDetails[" + i + "].File", item.File.FileName);
  i++;
}